Ratchet and Clank is made by Insomniac studios, the same people responsible for the Spyro series, as well as the newer Resistance series. The first game was released on the Playstation 2 in 2002, and claimed to have the most weapons of any game before it. I'm pretty sure the claim was true, because there were over 36 of the fuckers, if the back of the box is to be believed. It starred Ratchet, a Lombax, Clank, a robot, Captain Qwark, a sellout hero, and Chairman Drek, a businessman. The last guy was the main villain of the game.
It did very well, and less than a year later, the second game, "Going Commando", was released. It had even more weapons to it's name, as well as a new mechanic to those weapons: they upgrade themselves the more you use them. I think the second game is one of the better games in the original series. In 2003, the third game, "Up Your Arsenal", was released, and upped the ante, not only giving us more weapons and gadgets, as well as introducing the best, and so far only recurring, villain of the series: Dr. Nefarious!
Then Insomniac, at least in my opinion, started slipping a little bit. They took one aspect of the last two games, the arena battles, and made an entire game based around those. "Ratchet: Deadlocked" was released in 2005, and was... not so good. For one, Clank was hardly available, and two, the arena worked because it was a distraction, not a main event. Two handheld titles, "Size Matters" and "Secret Agent Clank" were also released, but I've never played them, so I don't know how good they are (apparently pretty bad, from what I hear).
In 2007, Insomniac decided to reboot the series on the PS3. By "reboot" I mean "go back to making the games like they did before Deadlocked" and slapped a Future at the end of the titular character's names. The game plays much like the first three games and is very fun and enjoyable, as well as a bit more streamlined, as you can afford most weapons and armor as you come to them, or if you can't, you don't have to wait long.
Original Archived Let's Play available at the Let's Play Archive